Well in most highschools and universities children/people sit for hours at a time behind desks while someone talks.
Did you stand for your lectures? Did you not have lectures? Is 6 hours a day not an extended period of time?
Did you stand for your lectures? Did you not have lectures? Is 6 hours a day not an extended period of time?
In college lectures was from a minimum of 3 hours to maximum of 5 hours depending on how many credit you took in the semester. But the actual learning happened outside of those hours and once again lectures were important only to create the base, maybe even only to provide an introduction to the base.